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Posted on 28 October 2026
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Sign in to report an errorRate: 89 – 119 / hour (B2B)
We are looking for a skilled Java Engineer to join Flix on a freelance/service agreement basis (B2B contract). This is a contractor engagement to work on impactful, hands-on challenges in the domain of financial technology.
Scope of Services
Bring expertise in Java-based backend development. Work across Flix's finance technology environment to build and maintain critical internal applications — from revenue accounting, invoices processing to bus partner settlements and payment reconciliation.
About the Engagement
Design, build, and maintain features for the internal data-heavy applications, supporting automated bus partner settlement generation across all FlixBus entities around the globe.
Develop and enhance the internal services that allow finance and billing teams to manage bus partners' settlement-relevant data and track changes via event history.
Communicate directly with business counterparts (finance, billing, and partner teams) to understand needs and shape solutions.
Actively participate in product development, from refinement and technical design through delivery and operations.
Implement and maintain event-driven data processing workflows using Kafka to support settlement operations.
Contribute to infrastructure-as-code practices and CI/CD pipelines on AWS, and run services on Docker/Kubernetes, with monitoring and observability (e.g. Datadog).
About You
At least 3 years of experience as a Software Engineer, with exposure to data processing systems
Proven experience working with Java in a commercial environment
Experience with event-driven architectures, ideally Kafka
Experience working with cloud-based infrastructure providers, ideally AWS
Solid SQL knowledge
Hands-on experience with Docker and Kubernetes (or similar container orchestration tools) and CI/CD
Familiarity with Snowflake or similar data warehousing solutions is a plus
Experience in front-end technologies (e.g., JavaScript, HTML5, React.js, or Angular) is a plus
Fluent in English
Cooperation model
Cooperation based on a service agreement (B2B/freelance contract), not an employment contract.
You will operate as an independent contractor, responsible for delivering agreed services and submitting invoices
Location: open for contractors based in Poland
About FlixBus
FlixBus (Flix) runs the long-distance bus and coach network used across Europe and beyond, coordinating a fleet it does not own through software rather than owning the buses. Munich-headquartered with a broad mix of roles, from engineering to local commercial operations.
